docs: def encode_multipart_formdata(fields, files):
      """
      fields is a sequence of (name, value) elements for regular form fields.
      files is a sequence of (name, filename, value) elements for data to be uploaded as files
      Return (content_type, body) ready for httplib.HTTP instance
      """
      BOUNDARY = '----------ThIs_Is_tHe_bouNdaRY_$'
      CRLF = '\r\n'
      L = []
      for (key, value) in fields:
          L.append('--' + BOUNDARY)
          L.append('Content-Disposition: form-data; name="%s"' % key)
          L.append('')
          L.append(value)
      for (key, filename, value) in files:
          L.append('--' + BOUNDARY)
          L.append('Content-Disposition: form-data; name="%s"; filename="%s"' % (key, filename))
          L.append('Content-Type: %s' % guess_content_type(filename))
          L.append('')
          L.append(value)
      L.append('--' + BOUNDARY + '--')
      L.append('')
      body = CRLF.join(L)
      content_type = 'multipart/form-data; boundary=%s' % BOUNDARY
      return content_type, body